A student measures the reaction H₂(g) + Cl₂(g) <=> 2 HCl(g) concentrations at a few different temperatures and obtains the equilibrium constant. The student wants to use the van't Hoff equation to roughly determine the reaction enthalpy assuming that it does not change over the region of interest. T(K) 300 500 4x1018 4x1031 Keq So the student plots the data in the InK vs 1/T diagram and obtains a linear fitting shown below: 80 8382 60 240 20 0 y-22585x-24632 0 (¹) 0.002 0.004 1000 4×108 What is the reaction enthalpy value obtain from this figure? kJ/mol 3sig fig. (hint, rearrange the equation so that you can clearly see the slop and the intercept)

Chemistry: The Molecular Science
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Chapter16: Thermodynamics: Directionality Of Chemical Reactions
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A student measures the reaction H2(g) + Cl₂(g) <=> 2 HCl(g) concentrations at a few different temperatures and obtains the
equilibrium constant. The student wants to use the van't Hoff equation to roughly determine the reaction enthalpy assuming that it
does not change over the region of interest.
500
T(K) 300
Keq 4x1031
4x1018
So the student plots the data in the InK vs 1/T diagram and obtains a linear fitting shown below:
8 8 8 8
60
40
20
0
0
y-22585x-24632
(0.002
0.004
1000
4x108
What is the reaction enthalpy value obtain from this figure?
kJ/mol 3sig fig.
(hint, rearrange the equation so that you can clearly see the slop and the intercept.)
Transcribed Image Text:A student measures the reaction H2(g) + Cl₂(g) <=> 2 HCl(g) concentrations at a few different temperatures and obtains the equilibrium constant. The student wants to use the van't Hoff equation to roughly determine the reaction enthalpy assuming that it does not change over the region of interest. 500 T(K) 300 Keq 4x1031 4x1018 So the student plots the data in the InK vs 1/T diagram and obtains a linear fitting shown below: 8 8 8 8 60 40 20 0 0 y-22585x-24632 (0.002 0.004 1000 4x108 What is the reaction enthalpy value obtain from this figure? kJ/mol 3sig fig. (hint, rearrange the equation so that you can clearly see the slop and the intercept.)
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